Hydrocarbons PYQs Set 7 (PDF)

Set 7 of 16 · Questions 181-210 of 459

In the print window choose “Save as PDF”. The file prints without a web address or date line.

Mere Teacher · Previous Year Questions JEE Main Chemistry · Hydrocarbons · Set 7 (Q181-210)
Scan or visit mereteacher.com for free PYQ practice, timed CBT tests, step-by-step solutions and BroBot AI. Answers and solutions are free with a sign-up.
181. $The correct order of rates of addition of Br_{2} / water to the following alkenes is [A] CH_{2} = CH_{2} [B] CH_{2} = CH - NO_{2} [C] CH_{3} - CH_{2} - CH = CH_{2} [D]$ (1) $[D] > [C] > [A] > [B]$ (2) $[D] > [C] > [B] > [A]$ (3) $[A] > [B] > [C] > [D]$ (4) $[A] > [B] > [D] > [C]$ 182. $Compound X on reaction with O_{3} followed by Zn / H_{2} O gives formaldehyde and 2-methyl propanal as products. The compound X is:$ (1) $Pent-2-en$ (2) $3-Methylbut-1-ene$ (3) $2-Methylbut-1-ene$ (4) $2-Methylbut-2-ene$ 183. $Identify the major product B in the given sequence of reactions CH_{3} - C \equiv CH H_{2} Pd/C A (C_{6} H_{5} CO)_{2} O_{2} HBr B$ (1) $C H_{3} - C H (B r) - C H_{3}$ (2) $CH_{3} - CH_{2} - CH_{2} Br$ (3) $C H_{3} - C H (B r) - C H_{2} B r$ (4) $CH_{3} - CH_{2} - CHBr_{2}$ 184. $Nitration of aniline in strong acidic medium also given m-nitroaniline because$ (1) $In spite of substituents nitro group always goes to only m-position.$ (2) $In acidic (strong) medium aniline is present as anilinium ion.$ (3) $In absence of substituents nitro group always goes to m-position.$ (4) $In electrophilic substitution reactions amino group is meta directive.$ 185. $The compound which will have the lowest rate towards nucleophilic aromatic substitution on treatment with O H^{-} is$ (1) (2) (3) (4) 186. $Given below are two statements: Statement- I : 2 -methylbutane on oxidation with KMnO_{4} gives 2 -methylbutan- 2 - o 1 . Statement- II : n -alkanes can be easily oxidised to corresponding alcohol with KMnO_{4} . Choose the correct option:$ (1) $Both statement I and statement II are correct$ (2) $Both statement I and statement II are incorrect$ (3) $Statement I is correct but Statement II is incorrect$ (4) $Statement I is incorrect but Statement II is correct$ 187. $Identify the following compound which exhibits geometrical isomerism.$ (1) $But-2-ene$ (2) $But-1-ene$ (3) $Butane$ (4) $Iso-butane$ 188. $Identify the correct statements for a ring system to exhibit aromaticity (I) It must not be planar. (II) It must possess (4 n + 2) π -electrons. (III) It must be planar. (IV) It must possess 4 nπ -electrons. The correct answer is$ (1) $II, IV$ (2) $I, II$ (3) $I, IV$ (4) $II, III$ 189. $Which of the following reagent is used to find out carbon-carbon multiple bonds?$ (1) $Grignard reagent$ (2) $Baeyer's reagent$ 190. $Ethyl benzene cannot be prepared by$ (1) $Wurtz reaction$ (2) $Wurtz-Fittig reaction$ (3) $Friedel-Crafts reaction$ (4) $Clemmensen reduction.$ 191. $The major product of the following addition reaction is H_{3} C - CH = C H_{2} C l_{2} / H_{2} O$ (1) $H_{3} C - C H (O H) - C H_{2} (C l)$ (2) $H_{3} C - C H (O H) - C H_{2} (C l)$ (3) (4) $H_{3} C - C (= O) - C H_{3}$ 192. $Which of the following is suitable to synthesize chlorobenzene?$ (1) $Aniline (C_{6} H_{5} N H_{2}), HCl, heating$ (2) $Benzene, C l_{2}, anhydrous FeC l_{3}$ (3) $Phenol, NaN O_{2}, HCl, CuCl$ (4) $Benzene, HCl$ 193. $The non-aromatic compound among the following is$ (1) (2) (3) (4) 194. $Three isomers A, B and C ( mol. formula C_{8} H_{11} N) give the following results A and c \to Diazotization P + Q \to (ii) Oxidation (KMnO_{4} + H^{+}) (i) Hydrolysis R (product ofA) + S (product ofC) R has lower boiling point than S B \to C_{6} H_{5} SO_{2} Cl alkali-insoluble product A, B and C, respectively are$ (1) (2) (3) (4) 195. $Some meta - directing substituents in aromatic substitution are given. Which one is most deactivating ?$ (1) $-SO3H$ (2) $-COOH$ (3) $-NO2$ (4) $-C\equivN$ 196. $Which of these will not react with acetylene?$ (1) $NaOH$ (2) $ammonical AgNO3$ (3) $Na$ (4) $HCl.$ 197. $Products of the following reaction :$ (1) $C H_{3} COOH + C O_{2}$ (2) $C H_{3} COOH + H O O C C H_{2} C H_{3}$ (3) $C H_{3} C H O + C H_{3} C H_{2} C H O$ (4) $C H_{3} COOH + C H_{3} C O C H_{3}$ 198. $Water does not produce CO on reacting with:$ (1) $C_{3} H_{8}$ (2) $C$ (3) $CH_{4}$ (4) $CO_{2}$ 199. $But-2-yne and hydrogen (one mole each) are separately treated with (i) Pd / C and (ii) Na / liq . NH_{3} to give the products X and Y respectively. But-2-yne + H_{2} Pd/C X But-2-yne + H_{2} Na/Liq.NH_{3} Y Identify the incorrect statements.(A) X and Y are stereoisomers.(B) Dipole moment of X is zero.(C) Boiling point of X is higher than Y.(D) X and Y react with O_{3} / Zn + H_{2} O to give different products. Choose the correct answer from the options given below:$ (1) $(B) and (D) Only$ (2) $(A) and (C) Only$ (3) $(A) and (B) Only$ (4) $(B) and (C) Only$ 200. (1) (2) (3) (4) 201. $Ph - CH = CH_{2} (PhCOO)_{2} HBr Product Consider the above reaction(A) The reaction proceeds through a more stable radical intermediate.(B) The role of peroxide is to generate H^{\circ} (Hydrogen radical).(C) During this reaction, benzene is formed as a byproduct.(D) 1-Bromo-2-phenylethane is formed as the minor product.(E) The same reaction in absence of peroxide proceeds via carbocation intermediate. Identify the correct statements. Choose the correct answer from the options given below:$ (1) $(C), (D) & (E) Only$ (2) $(A, (B) & (D) Only$ (3) $(A) (C) & (E) Only$ (4) $(A) & (E) Only$ 202. $Least energetic conformation of cyclohexane is$ (1) $chair conformation$ (2) $boat conformation$ (3) $cis conformation$ (4) $E - Z form.$ 203. $In the following reaction CH_{3} (CH_{2})_{4} CH_{3} Anhy. AlCl_{3} HCl Δ major product X'X' is$ (1) (2) $C H_{3} C H (C H_{3}) - (C H_{2})_{2} C H_{3}$ (3) $C H_{3} (C H_{2})_{4} C H_{2} Cl$ (4) $Cl - C H_{2} - (C H_{2})_{4} - C H_{2} - Cl$ 204. $Which of the following conformers for ethylene glycol is most stable?$ (1) (2) (3) (4) 205. $Identify (P)$ (1) (2) (3) (4) 206. $The number of σ and π bonds present in pent-1-ene-4-yne is :$ (1) $3, 10$ (2) $9, 4$ (3) $4, 9$ (4) $10, 3$ 207. $Electrophile in the case of chlorination of benzene in the presence of F e C 1_{3} is$ (1) $C 1$ (2) $F e C 1_{3}$ (3) $C 1^{+}$ (4) $C 1^{-}$ 208. $Cyclopentadienyl anion is$ (1) $benzenoid and aromatic$ (2) $non-benzenoid and aromatic$ (3) $non-benzenoid and non-aromatic$ (4) $non-benzenoid and anti-aromatic$ 209. (1) (2) (3) (4) 210. $17 mg of a hydrocarbon (M.F. C_{10} H_{16}) takes up 8.40 mL of the H_{2} gas measured at 0°C and 60 mm of Hg. Ozonolysis of the same hydrocarbon yields The number of double bond/s present in the hydrocarbon is________.$